WIDE RANGE OPERATION CONTROL STRATEGY FOR ELECTROLYSIS HYDROGEN PRODUCTION BASED ON RENEWABLE ENERGY
This paper analyzes the inefficiency mechanism of low-load alkaline water electrolyzers(AWEs).It is found that through modifying the excitation electric field,the low-load performance of AWEs can be greatly enhanced.Based on this,a multi-modal self-optimization(MMSO)control strategy and the corresponding prototype converter are proposed.The effectiveness of the proposed method is verified by a 2 Nm3/h AWE(about 10 kW)directly driven by PV arrays.Experimental results show that compared to the conventional DC power supply,1)the maximum efficiency improvement can exceed two times,2)under the constraint of efficiency≥50%,the system operation is enhanced from 30%-100%to 10%-100%of rated load;3)the AWE can follow the fluctuating PV power well.
renewable energyhydrogen productionelectrolytic cellsenergy efficiencyfluctuating hydrogen productionwide operation range
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